Postbuckling of pressure-loaded FGM hybrid cylindrical shells in thermal environments
Postbuckling of pressure-loaded FGM hybrid cylindrical shells in thermal environments
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DOI：
10.1016/j.compstruct.2005.08.006
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发表时间：
2007-02-01
影响因子：
6.3
通讯作者：
Noda, N.
中科院分区：
文献类型：
--
作者：
Shen, Hui-Shen;Noda, N.
本文研究了热环境中具有压电作动器的功能梯度材料圆柱壳在侧向压力或静水压力及电荷载作用下的后屈曲问题。热传导和温度依赖的材料特性都考虑在内。假设温度场在壳体表面上均匀分布，沿厚度方向变化，电场只有非零分量E-Z。功能梯度材料（FGMs）的材料性能被假定为在厚度方向上根据一个简单的幂律分布的组分的体积分数的梯度，和FGM和压电层的材料性能被假定为温度依赖性。控制方程是基于高阶剪切变形理论与von Karman-Donnell型的运动非线性。将壳体屈曲的边界层理论推广到有限长功能梯度材料混杂层合圆柱壳的情形。采用奇异摄动法确定了屈曲压力和后屈曲平衡路径。数值例子关注的后屈曲行为的压力加载，完善和不完善，功能梯度材料圆柱壳与完全覆盖的压电致动器在不同的热和电负载条件下。结果表明，温度依赖性，温度变化和体积分数分布有显着的FGM杂交圆柱壳的屈曲压力和后屈曲行为的影响。相比之下，控制电压对功能梯度材料混杂圆柱壳的屈曲压力和后屈曲行为的影响很小。(c)2005爱思唯尔有限公司保留所有权利。
A postbuckling analysis is presented for a functionally graded cylindrical shell with piezoelectric actuators subjected to lateral or hydrostatic pressure combined with electric loads in thermal environments. Heat conduction and temperature-dependent material properties are both taken into account. The temperature field considered is assumed to be a uniform distribution over the shell surface and varied in the thickness direction and the electric field considered only has non-zero-valued component E-Z. The material properties of functionally graded materials (FGMs) are assumed to be graded in the thickness direction according to a simple power law distribution in terms of the volume fractions of the constituents, and the material properties of both FGM and piezoelectric layers are assumed to be temperature-dependent. The governing equations are based on a higher order shear deformation theory with a von Karman-Donnell-type of kinematic nonlinearity. A boundary layer theory of shell buckling is extended to the case of FGM hybrid laminated cylindrical shells of finite length. A singular perturbation technique is employed to determine the buckling pressure and postbuckling equilibrium paths. The numerical illustrations concern the postbuckling behavior of pressure-loaded, perfect and imperfect, FGM cylindrical shells with fully covered piezoelectric actuators under different sets of thermal and electric loading conditions. The results reveal that temperature dependency, temperature change and volume fraction distribution have a significant effect on the buckling pressure and postbuckling behavior of FGM hybrid cylindrical shells. In contrast, the control voltage only has a very small effect on the buckling pressure and postbuckling behavior of FGM hybrid cylindrical shells. (c) 2005 Elsevier Ltd. All rights reserved.